After Babylon destroyed Jerusalem, the Edomites captured fleeing Jews. Then they gave these Jews over to Babylon. The Book of Obadiah is about Yahweh judging the Edomites for harming his people. This book would be comforting to the exiled people of Judah.
This book is traditionally titled "The Book of Obadiah" or just "Obadiah." Translators may decide to use a clearer title such as "The Sayings of Obadiah." (See: [[rc://en/ta/man/translate/translate-names]])
Obadiah referred to Edom as Israel's brother. This is because the Edomites descended from Esau, and the Israelites descended from Jacob. Jacob and Esau were brothers. This made Edom betraying Israel much worse.
The Book of Obadiah speaks of the pride of Edom. This meant that the Edomites thought their enemies or Yahweh could not defeat them. (See: [[rc://en/tw/dict/bible/other/proud]])